Structural Feature-Based Image Hashing and Similarity Metric for Tampering Detection

Authors:
Zhenjun Tang;Shuozhong Wang;Xinpeng Zhang;Weimin Wei
Affiliations:
(Also works: Department of Computer Science, Guangxi Normal University, Guilin 541004, China) School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China. tang ...;(Correspd.) School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China. tangzj230@163.com/ shuowang@shu.edu.cn, xzhang@shu.edu.cn, wwm@shu.edu.cn;School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China. tangzj230@163.com/ shuowang@shu.edu.cn, xzhang@shu.edu.cn, wwm@shu.edu.cn;School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China. tangzj230@163.com/ shuowang@shu.edu.cn, xzhang@shu.edu.cn, wwm@shu.edu.cn
Venue:
Fundamenta Informaticae
Year:
2011

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Abstract

Structural image features are exploited to construct perceptual image hashes in this work. The image is first preprocessed and divided into overlapped blocks. Correlation between each image block and a reference pattern is calculated. The intermediate hash is obtained from the correlation coefficients. These coefficients are finally mapped to the interval [0, 100], and scrambled to generate the hash sequence. A key component of the hashing method is a specially defined similarity metric to measure the “distance” between hashes. This similarity metric is sensitive to visually unacceptable alterations in small regions of the image, enabling the detection of small area tampering in the image. The hash is robust against content-preserving processing such as JPEG compression, moderate noise contamination, watermark embedding, re-scaling, brightness and contrast adjustment, and low-pass filtering. It has very low collision probability. Experiments are conducted to show performance of the proposed method. (This work was supported by the NSF of China (60773079, 60872116, and 60832010), the High-Tech Res. and Dev. Prog. of China (2007AA01Z477), the Innovative Res. Fdn. of Shanghai Univ. for Ph.D. Programs (shucx080148), and the Sci. Res. Fdn. of Guangxi Normal Univ. for Doctors.)